Every provider has a perticular email address, a good list can be found here :
http:
You can easily send sms via this for example if you want to send an sms to idea user just mail on this address:
Number you want to send to@ideacellular.net
like this :
9848number@ideacellular.net
Remember there is specific limit on message count, generally its 160 chars.
If you want to know how to send email please post here.